III-98
Cause: The condenser is not functioning correctly or there may
be an overcharge of refrigerant inside the system. Another
possibility is lack of (ram) air flow through the condenser
fins during testing. Engine cooling system component
malfunction can cause high pressure by blocking air flow
(radiator shutter) or not providing air flow (fan clutch) in
sufficient quantity.
Repair Procedure:
Inspect the condenser for dirt, bugs or other debris and clean
if necessary. Be sure the condenser is securely mounted and
there is adequate clearance (about 1-1/2 inches) between
it and the radiator. Check the radiator pressure cap and
cooling system, including the fan, fan clutch, drive belts
and radiator shutter assembly. Replace any defective parts
and then recheck AC system operation, gauge readings and
performance.
If the problem continues, the system may be over- charged
(have too much refrigerant inside). Recover the system
slowly until low and high pressure gauges read below nor-
mal, and bubbles appear in the sight glass. Then add refrig-
erant (charge the system) until pressures are normal and
the bubbles disappear. Add another quarter to half pound of
refrigerant and recheck AC system operation, gauge read-
ings and performance.
If the high gauge readings do not change, you should recover
all of the refrigerant and flush (it may be partially plugged)
or replace the condenser. Also replace the receiver-drier or
accumulator. Then connect the components and evacuate
the system. Recharge the air conditioner with refrigerant
and check system operation and performance.
Manifold Gauge Set Readings
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